In this article, we seek to apply Julie Thompson Klein's supple understanding of typology as both category-making and category-defying to one aspect of her own body of work: her participation in a range of organizations with permeable boundaries. Specifically, we review her contributions to theories of boundary work in interdisciplinary studies and then her applications of those theories to building new academic institutions and networks that mirror and support related goals. We concentrate on Klein's work as a proponent of Digital Humanities (DH) and, in particular, on Klein as a founding member and leader of a boundary-breaking, cross-institutional, and cross-disciplinary alliance, HASTAC (Humanities, Arts, Science, and Technology Alliance and Collaboratory: HASTAC.org), the world's first and oldest academic social network, a participatory, constantly evolving, user-driven online community that has grown to more than 17,000 network members.